Burglar signal alarm for safes



Sept. 16, 1930. Y J. KEREKl-:s 1,776,121

BURGLAR SIGNAL ALARM FOR SAP'ES Original Filed Oct. l5, 1925 INVENTOR.

ATTORNEx/v v Patented Sept. 16, 1930 i i .i i

UNITED STATES PATENT OFFICE JOSEPH RER-EXES, F DETROIT, MICHIGAN BURGLAR SIGNAL ALARM FOR SAFES Application iled October 15, 1925, Serial No. 62,508. Renewed May 31, 1930.

This invention relates generally to alarms such as will cause the horn 15 to be soundfor safes and the like, the invention having ed when the electrical circuit between the more particular reference to a novel type of inner wall 12 and the outer wall 13 is comswitch therefor. The invention has for an pleted by means of a drill or any instruobject the provision of an improved device ment which would pierce the walls. 55

which will sound an alarm when a safe is My improved plunger switch 21 is attached opened or tampered with. A further object to the bracket 22 and is wired so that by of the invention is to provide a device of this means of a completed circuit across the ternature which will also sound an alarm in minals 23 and 24 suitably located on the event an attempt should be made to move the closed end 28 of the hollow cylinder 27, by 6o safe. means of the circuit breaker 25 the horn 15 For further comprehension of the invenwill be sounded. tion, and of the objects and advantages there- My improved plunger switch 26 identical of, reference will be had to the following dein design and construction to the heretofore scription and accompanying drawing and to mentioned plunger switch 21 is attach-ed as '3a the appended claim in which the various will be hereinafter described, and is wired novel features of the invention are more parso that by means of a completed circuit ticularly set forth. Y across the terminals 44 and 45 by means of Fig. 1 of the drawing vis aside sectional the circuit breaker 29 the horn 15 will be view of my improved safe. sounded as described in connection with the 'in Fig. 2 is a front elevational view. heretobefore mentioned plunger switch 21. Fig. 3 is a sectional view taken on the line Referring in particular to Fig. 4 of the 3 3 of Fig. 1. y accompanying drawing, in Vwhich I have Fig. 4 is an enlarged sectional detail view shown an enlarged cross sectional detail view of my improved plunger switch. of my improved plunger switch as shown and 75 Fig. 5 is a sectional view taken on the line referred to by the heretobefore mentioned 5 5 of Fig. 4. numerals 21 and 26. This device comprises Fig. 6 is a sectional view taken on the line a hollow cylinder 27 having one of its ends 6 6 of Fig. 4. closed as designated by the numeral 28, f1,

Fig. 7 is a sectional view taken on the line slidable piston 29 or cylindrical disc is at- Si? 7 7 of F ig. 4. Y tached to the operating rod 30 having one Fig. 8 is a diagrammatic view of the electriend protruding through a suitable aperture cal system. in the said closed end 28 of the hollo-w cyl- As here embodied a safe 10 is shown with` inder and attached at that end the heretoa layer 11 of any suitable insulating matebefore mentioned circuit breaker as desig- S5 rial placed between the inner wall 12 and nated by the said numerals 25 and 29, the the outer wall 13 of the said safe 10. The other end of the operating rod protruding said outer wall 13 of the safe 10 is connected through a suitable aperture in the rotatable by means of an insulated wire 14 to a horn disc 30 and also in the cover 31, and so 15 of any similar device, the inner wall 12 mounted as to be a slidable fit in the aperof the safe 10 being connected to a switch tures, the coil spring 32 being placed over 16 of the locked type by means of an insuthe operating rod 30 between the closed end lated wire 17 and to the battery 18 of suit- 28 of the hollow cylinder 27 and the piston able capacity or any suitable source of elec- 29. Referring also to Figures 5 and 6, the

tricity, by means of the insulated wire 19, cover 31 is attached to the open end of the 95 the said insulated wires 17 and 19 being conhollow cylinder 27 by means of a plurality nected to the said switch 16 so as to disenof screws 33 or any suitable device so as to gage with the said switch 16 when the door allow the said rotatable disc 30 to be placed 2O of the safe 10 is opened. The heretobeunder the said cover 31 and so located as to 59 fore mentioned construction and wiring is be easily rotated or turned by means of the IUU lll handle 34 or conveniently located lever protruding through a suitably located slot in the said cover 31; the heretobefore mentioncd construction being such as will permit a plurality of apertures 36 conveniently and suitably located in the said cover 3l, to coincide with a plurality of similar apertures 87 in the said rotatable disc 30 by means of the said handle 34, a leaf spring 38 being placed between the said handle 34 and the cover 3l and having its extremities extending in suitably located indentures 39 so located as to hold the rotatable disc 30 in any desired position. Y

My improved lunger switch as designated by the numeral 2l attached to the said bracket 22 by means of slots 4l in the said bracket 22 to slidably accommodate the protruding portion of the` said hollow cylinder 27, the slots el extending lengthwise of the bracket 22, the hollow cylinder 27 having a suitably located lug e2 with Va threaded aperture to accommodate the hand screw d3, so that the plunger switch rmay be attached in any desired position on the bracket 22, the bracket 22 being attached at any desired location on the inner wall l2, so that the operating rod 30 will make contact with the inner side of the door 2O of the safe lO, as shown in Figures 1,13 and Ll ofthe accompanying drawing. ln event the safe door is opened, the coil spring 32 will cause the circuit breaker 25 to complete theccircuitand the horn l5 will be sounded, by means of the handle 3e of the rotatable disc 3() the timing of the closing of the plunger switch 2l may be determined, as the plurality of apertures 36 and 37 may only partly coincide, in which event it would take a longer time interval for the air between the piston 29 and the rotatable disc 30 to be expelled, were the plurality of apertures 36 and 37 coincidental, consequently the action of completing the said circuit would be slower. A slow action here described would permit any one such as a bank on'icial familiar with the location of the plunger .switch 2l, to open the safe door and stop the completing of the said circuit so that the said horn l5 would not be sounded. lt should be understood that the same results couldrbe obtained by attaching the plunger. switch 21 on the bracket 2:2 at a relative close position to the door 20.

Referring in particular to my'improved plunger switch as designated by the heretobefore mentioned numerals 26, as heretobefore stated the plunger switch 26 is identical in design and construct-ion to the heretobefore mentioned plunger' switch 21 but is attached to any part of 'the building so that the said operating rod 30r will make contact with any part of the outer surface of the said safe l0, preferably the bottom of one of the legs el as shown in Figures l and 2 of the accompanying drawing, so that in event the safe is moved the coil spring 3Q will cause the circuit breaker 29 to complete the circuit and the horn will be sounded.

Having described my improved safe and my improved plunger switch fully its use and manipulation is obvious. lt should be understood that my improved device may be made of any suitable materials such as used in devices of this nature.

' lNhile I have above described the preferred form, construction and arrangement of the several elements employed, it will be understood 4that the device is nevertheless, susceptible of considerable modification therein, and l therefore reserve the privilege of resorting to all such changes as be fairly embodied within the spirit and scope of the invention as claimed.

Having thus described my invention, what l claim as new, and desire to protect by Letters Patent of the United States is as follows ln a cylinder and piston type circuit closer, a means for retarding the piston motion, comprising a cover having a base portion and a flange portion, the flange portion being attached to the end ofthe cylinder, providing a space between the end of the cylinder and the base portion, a disc rotatively mounted in the space, the flange portion of the cover.

being formed with a slot, a handle attached to the disc and projecting from the slot, the base portion ofthe cover being formed with a plurality of apertures, the disc being formed with a plurality of apertures alignable with the apertures of the base portion in one position of the disc, the handle being movable to turn the disc to disalign the said apertures, and a leaf spring attached to the handle, the ends thereof engaging against the flange portion so as to hold the rotatable disc in adjusted positions, to adjust the rate of retardation of the piston.

ln testimony whereof I have affixed Vmy signature.

JOSEPH KEREKES. 

